KR102505782B1 - Electrical Safety System for Switchboards to Prevent Grounding Accidents due to Grounding Defects Using the Internet of Things - Google Patents

Abstract

The present invention provides an electrical safety system for a switchboard to prevent grounding accidents due to grounding defects using the Internet of things (IoT), comprising: a grounding detection circuit detecting a grounding current occurring due to grounding defects; a micro controller unit (MCU) determining a grounding current by comparing data of the grounding current detected by the grounding detection circuit with data of a pre-entered normal current; a grounding current detection unit including a second current blocking circuit electrically connected to the MCU, and blocking a second current supplied to the switchboard; a handle protection cap driving circuit electrically connected to the MCU and receiving power by the control of the MCU; a handle protection cap operation unit including a handle protection cap installed on a switchboard door, and moving straight to the sides by the driving of the handle protection cap driving circuit, and covering and surrounding a handle installed on the switchboard door; a server electrically connected to the MCU, and receiving the generation of a grounding current and the discharge of a grounding current and the like in real time; and a remote control unit including a user interface wirelessly connected to the server, and supplying power to the handle protection cap driving circuit when the discharge of the grounding current is confirmed, and returning the handle protection cap to the initial status, and exposing the handle to the outside.

Description

Electrical Safety System for Switchboards to Prevent Grounding Accidents due to Grounding Defects Using the Internet of Things

The present invention relates to an electrical safety system of a switchboard for preventing ground fault accidents due to ground failure using the Internet of Things. It covers and surrounds the handle installed on the switchboard door, and at the same time transmits it to the manager in real time through the Internet of Things to prevent workers on site from operating the handle, preventing various safety accidents such as electric shock caused by ground fault current. It relates to an electrical safety system of a switchboard for preventing ground fault accidents due to poor grounding using possible IoT.

In general, a switchgear is a device used for monitoring, control, and protection of an electric power system, and refers to an assembly of unit devices, support structures, and wires connecting them. The power panel includes facilities to receive power from KEPCO or control panels to operate the facilities. In addition, the switchboard has built-in facilities for distributing power to the places where it is intended to be used, or has panels that control the facilities.

In general consumers, most of the switchboards are together, and examples of switchboards include high-voltage closed switchboards, high-voltage switchboards, low-voltage switchboards, power switchboards for subways, switchboards for water purification plants, motor control centers, booth duct systems, and the like.

The switchgear has a partition-type housing structure called a cubicle in the form of an exterior, and inside it is a relay and A control panel on which electric parts such as instruments and the like are mounted.

Inside the housing structure, in addition to power devices, busbars that connect power devices to each other according to the power system and wiring for measuring and monitoring power devices are arranged, and the housing structure and its internal control panel are installed on a safe concrete floor. . On the concrete floor where the housing structure is to be mounted, wirers for monitoring wiring between power devices and wiring of load facilities are formed.

Meanwhile, a leakage current detection device is installed in a conventional switchboard, and the leakage state is displayed step by step according to a set value so that a manager can easily observe the leakage current for each line with the naked eye.

Representatively, the Republic of Korea Intellectual Property Office Registration No. 10-1016378 (name: switchboard for easy measurement of leakage current of a ground wire) (hereinafter referred to as prior art) can be cited as an example.

The prior art includes a leakage current detector for converting a current measured by being connected on a plurality of ground lines into a predetermined digital signal, a relay circuit unit for selectively inputting and outputting the current measured on each ground line, and a measured through the ground line. An input unit that sets an operating reference value that is compared with the digital signal of the current, a controller that determines the state of the ground wire by comparing the digital signal measured from the ground wire with the operating standard value, and an alarm for the state of the ground wire according to the determination of the controller The gist of the present invention is to include an alarm unit that generates a signal, and a display unit that displays the leakage current value measured in the ground line and the ground line condition according to the judgment of the control unit.

However, in the prior art, there is no way to confirm that the leakage current is completely removed even if the alarm unit checks the leakage current and generates an alarm signal. When the door is opened, undischarged leakage current flows to the switchboard handle, which may cause various safety accidents such as electric shock.

Prior Art Document 1: Korean Intellectual Property Office Registered Patent Publication No. 10-1016378

An object of the present invention to solve the above problems is to automatically operate the handle protection cap when a ground fault current occurs due to a faulty grounding such as a bus bar to cover and surround the handle installed on the switchboard door, and at the same time through the Internet of Things Electricity of the switchboard to prevent ground fault accidents due to poor grounding using the Internet of Things, which can prevent various safety accidents such as electric shock due to ground fault current by having the manager transmit in real time to prevent the operator on the site from operating the handle To provide a safety system.

Another technical problem of the present invention is to provide a switchboard handle automatic protection cap that automatically operates the handle protection cap and opens the switchboard handle so that the operator can safely open the switchboard door by directly operating the handle after the ground fault current is discharged. there is.

The present invention for achieving the above objects is an electrical safety system of a switchboard for preventing a ground fault accident due to a ground failure using the Internet of Things that surrounds a handle installed on a switchboard door of a switchboard to prevent a ground fault accident, A ground fault detection circuit that detects the ground fault current generated by the ground fault detection circuit, an MCU (Micro Controller Unit) that determines the ground fault current by comparing the data of the ground current detected by the ground fault detection circuit with the data of the already input normal current, and the MCU and the electrical A ground fault current detection unit connected to and composed of a secondary current blocking circuit that blocks secondary current supplied to the switchboard, a handle protection cap driving circuit electrically connected to the MCU and supplied with power under the control of the MCU, the switchboard A handle protection cap operating unit composed of a handle protection cap installed on the door and moving in a straight left and right direction by driving the handle protection cap driving circuit and covering and surrounding the handle installed on the switchboard door, electrically connected to the MCU The server receives the generation of ground fault current and the discharge of ground fault current in real time, and is wirelessly connected to the server. When the discharge of ground fault current is confirmed, power is supplied to the handle protection cap drive circuit to set the handle protection cap to an initial state. It is characterized in that it is configured to include a remote control unit composed of a user interface that returns to and exposes the handle to the outside.

The handle protection cap driving circuit includes a motor, a pinion coupled to the shaft of the motor, and a rack gear meshed with the pinion and linearly moving the handle protection cap by the rotational motion of the pinion while attached to the upper surface of the handle protection cap. It is preferable to configure with

Preferably, a sensor is installed on the switchboard door, and the sensor detects when the handle protection cap surrounds the handle and is positioned properly, and transmits a signal to the MCU to cut off power supplied to the motor.

In the present invention, when a ground fault current occurs due to poor grounding of a bus bar, the handle protection cap is automatically operated to cover and surround the handle installed on the switchboard door, and at the same time transmit it to the manager in real time through the Internet of Things to the site It has the effect of preventing the occurrence of various safety accidents such as electric shock due to ground fault current by preventing a worker with a handle from operating the handle.

In addition, after the ground fault current is completely discharged, the handle protection cap can be operated remotely to expose the handle, so that the work can be performed quickly.

1 is a view showing a switchboard to which an electrical safety system of the switchboard for preventing ground faults due to ground faults using the Internet of Things according to the present invention is grafted.
FIG. 2 is a view showing a state in which the handle protection cap operates to surround the handle when a ground fault occurs in FIG. 1;
3 is a view showing the overall configuration of an electrical safety system of a switchboard for preventing ground faults due to ground failure using the Internet of Things according to the present invention.
Figure 4 is a view showing the main configuration of the handle protection cap driving circuit in the present invention.
5 is a view showing the operational flow of an electrical safety system of a switchboard for preventing a ground fault accident due to ground failure using the Internet of Things according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the detailed description to be described later, a representative embodiment of the present invention will be presented to achieve the above-described technical problem. And other embodiments that can be presented as the present invention are replaced by description in the configuration of the present invention.

Attached FIG. 1 is a view showing a switchboard to which an electrical safety system of a switchboard is grafted to prevent a ground fault accident due to a ground fault using the Internet of Things according to the present invention, and FIG. 2 is a view showing a handle protection cap in case of a ground fault accident in FIG. Figure 3 is a view showing the overall configuration of an electrical safety system of a switchboard for preventing ground faults due to poor grounding using the Internet of Things according to the present invention, and Figure 4 is a diagram showing a state in which the handle is in operation Figure 5 is a drawing showing the main configuration of the handle protection cap driving circuit extracted from the present invention, and FIG. it is a drawing

As shown in FIGS. 1 to 5, the system configuration for controlling the automatic protection cap of the switchboard handle for preventing ground fault accidents due to poor grounding using the Internet of Things includes a ground fault current detection unit 10, a handle protection cap operation unit 20, and a remote control unit. It is composed by dividing by (50).

The ground fault current detection unit 10 detects that the current supplied from the power supply unit is overcurrent, i.e., a current higher than the rated current flows due to an overload in the circuit, a short circuit, etc. It is a means of detecting ground fault current that can cause fire, electric shock, or damage to equipment while flowing.

The ground current detection unit 10 includes a ground fault detection circuit 12, an MCU 14, and a secondary current blocking circuit 16.

The ground fault detection circuit 12 detects the zero phase current sent from the zero phase current circuit when a ground fault current such as a ground fault occurs.

The MCU (Micro Controller Unit) 14 compares the data of the ground current detected by the ground detection circuit 12 with the data of the already input normal current and determines the ground current. When the MCU 14 determines that the ground fault current is applied, the current is applied to the handle protective cap driving circuit 30 through the power supply unit, and the secondary current blocking circuit 16 installed in the ground current detection unit 10 is turned off. It operates to cut off the secondary current supplied to the switchboard.

The MCU 14 is electrically connected to the server 52 of the remote control unit 50, and transmits ground fault current data input to the MCU 14 in real time, and the operator remotely via the user interface 54. to control the condition of the switchboard.

The handle protective cap operation unit 20 is automatically driven by receiving current supplied through the power supply unit when a ground fault current is detected by the above-described ground fault current detection unit 10, and surrounds the handle of the switchboard so that the operator can operate the switchboard 100. By preventing the door 110 from being opened, safety accidents such as electric shock are prevented.

The handle protection cap operation unit 20 is composed of a handle protection cap driving circuit 30 and a handle protection cap 40.

The handle protective cap driving circuit 30 drives a motor 32 that receives current from the power supply unit through the MCU 14 and drives the handle protective cap 40 with the power of the motor 32 when a ground fault current occurs. It consists of a driving part that drives.

The drive unit is composed of a pinion 34 and a rack gear 36 engaged with the pinion 34 and installed on the handle protection cap 40, and the drive unit uses the power of the motor 32 to drive the pinion 34 ) rotates, the rack gear 36 moves the handle protection cap 10 forward and backward in a straight direction.

The handle protection cap 10 moves forward and backward linearly by the power of the driving unit and surrounds the handle 120 installed on the switchboard door 110 so that an operator who does not recognize it when a ground fault current is detected opens the switchboard door 110. When trying to open, the handle 120 cannot be manipulated so that the switchboard door 110 cannot be opened, thereby preventing safety accidents such as electric shock from occurring.

The handle protection cap 40 has a "⊃" shape, and both sides thereof are open, and a space 42 capable of accommodating the handle is provided inside.

The handle protection cap 40 is installed outside the switchboard door 110, preferably installed in front of the switchboard door 110, and a guide provided on one side of the handle 120 of the switchboard door 110. In the state where it is placed on the rail 38, it rides on the guide rail 38 with the power of the driving unit and reciprocates in a linear direction in the left and right directions.

The remote control unit 50 includes a server 52 electrically connected to the MCU 14 of the ground fault current detection unit 10 and a user interface 54 .

The server 52 receives ground fault current data input to the MCU 14 in real time.

The user interface 54 is wirelessly connected to the server 52 and checks the current leakage of the switchboard 100 through the server 52 in real time, and at the same time, if no ground fault current is detected, the MCU 14 The motor 32 of the handle protection cap driving circuit 30 is operated through the motor 32 to automatically return the handle protection cap 40, and the handle 120 installed on the switchboard door 110 is exposed to the outside again so that the handle 120 is remotely controlled so that the switchboard door 110 can be opened by the operator.

5 is a diagram illustrating an operation flow of an automatic protection cap for a handle of a switchboard preventing ground faults according to ground failure using the Internet of Things according to the present invention.

As shown in FIG. 5, when a ground fault current is generated due to leakage current in the process of supplying current to the switchboard 100 through the power supply unit, the zero phase current circuit detects the zero phase current, and the detected zero phase current is the ground fault current. It is transmitted to the MCU 14 of the sensing unit 10 (S10).

Subsequently, the normal current data previously input to the MCU 14 and the ground current data detected from the zero-phase current are compared and determined (S20). After transmitting (S30), the supply of the secondary current is cut off by operating the secondary side current blocking circuit 16 (S40).

In addition, the MCU 14 of the ground fault current detection unit 10 applies power to the motor 32, which is a driving unit constituting the handle protection cap driving circuit 30, and the pinion 34 axially coupled to the motor 32. ) The rack gear 36 meshed with the handle protection cap 40 linearly moves in one direction, and in this process, the handle protection cap 40 is installed in front of the van door 110. 38) and covers and surrounds the handle 120 of the switchboard door 110 (S50). At this time, after the handle protection cap 40 completely surrounds the handle 120, the sensor 90 detects it and transmits a signal to the MCU 14, through which the MCU 14 is supplied to the motor 32 of the drive unit. The power to be cut off to stop the movement of the handle protection cap (40).

As the handle 120 is surrounded by the handle protection cap 40, even if the worker at the site does not recognize the leakage of the ground fault current, the handle 120 covered by the handle protection cap 40 cannot be operated. Since (110) cannot be opened, electric shock accidents caused by leakage current can be prevented in advance.

Next, when it is determined that the ground fault current is completely discharged in the MCU 14, it is transmitted to the user interface 54 in real time through the server 52 of the remote control unit 50 (S60), and the operator who confirms this is the handle protection cap driving circuit Power is supplied again to the motor 32 of the furnace 30, and accordingly, the handle protection cap 40 returns to its initial state, and the handle 120 of the switchboard door 110 is opened to open the handle 120 exposed by the operator ( 12) to open the switchboard door 110 (S70).

Meanwhile, attached FIG. 6 shows a circuit diagram for detecting ground faults and ground faults of the switchboard in the present invention.

As shown in Figure 6, the ground fault detection principle detects the current of each phase in a three-phase wye connection circuit. If the vector sum of the phase currents is not 0, a ground fault current is generated, which is detected through the Ground Fault Relay and the relays of each phase are tripped.

In addition, the ground fault detection principle can obtain the ground current through the CT between the ground and the neutral point of the wye connection. In normal conditions, all the current supplied to the load flows to the ground, whereas in the case of leakage current or ground fault, each phase The difference between the sum of the currents supplied to the ground current and the ground current occurs, and by detecting this difference, a ground fault is detected.

In addition, the handle protection cap driving circuit is a commercial motor driver IC and the corresponding circuit, INDICATOR is an indicator display signal that displays the operation of the handle protection cap, and COMM_BUS is a communication signal BUS from MCU to server.

10: ground fault detection unit 12: ground fault detection circuit
14: Micro Controller Unit (MCU) 16: Secondary current blocking circuit
20: handle protection cap operation part 30: handle protection cap driving circuit
40: handle protection cap 50: remote control
52: server 54: user interface

Claims (3)

In the electrical safety system of a switchboard for preventing ground fault accidents due to poor grounding using the Internet of Things that surrounds the handle 120 installed on the switchboard door 110 of the switchboard 100 to prevent ground fault accidents,
a ground fault detection circuit 12 for detecting a ground fault current caused by a ground failure;
MCU (Micro Controller Unit) 14 for determining the ground current by comparing the data of the ground current detected by the ground fault detection circuit 12 with the data of the already input normal current;
a ground fault current detection unit 10 electrically connected to the MCU 14 and composed of a secondary current blocking circuit 16 that blocks secondary current supplied to the switchboard 100;
a handle protection cap driving circuit 30 electrically connected to the MCU 14 and supplied with power under the control of the MCU 14;
a guide rail 38 installed in front of the switchboard door 110;
It is placed on the guide rail 38, both sides are open in the shape of "⊃", and the handle protection cap driving circuit 30 is driven in a state in which a space 42 capable of accommodating the handle 120 is provided therein. It moves along the guide rail 38 in the left and right straight directions and covers and surrounds the handle 120 installed on the switchboard door 110 so that the operator cannot hold the handle 120 with his or her hand, so that the handle A handle protective cap operation unit 20 composed of a handle protective cap 40 to prevent an operator from being electrocuted by leakage current transmitted to (120);
a server 52 that is electrically connected to the MCU 14 and receives real-time transmission of ground fault current generation and ground fault current discharge;
It is wirelessly connected to the server 52 and when the discharge of the ground fault current is confirmed, power is supplied to the handle protection cap driving circuit 30 to initialize the handle protection cap 40 covering and surrounding the handle 120. It is configured to include a remote control unit 50 composed of a user interface 54 to return to the state and expose the handle 120 to the outside;
The handle protection cap driving circuit 30;
A motor 32 operated by being supplied with power by the control operation of the MCU 14 that determines ground fault current;
a pinion 34 coupled to the shaft of the motor 32;
Consisting of a rack gear 36 that is engaged with the pinion 34 and moves the handle protection cap 40 linearly by the rotational motion of the pinion 34 in a state attached to the upper surface of the handle protection cap 40, ;
A sensor 90 is installed on the switchboard door 110, and the sensor 90 senses when the handle protection cap 40 surrounds the handle 120 and is positioned in the right position, and signals to the MCU 14. Electricity of the switchboard for preventing ground fault accidents due to poor grounding using the Internet of Things, characterized in that by transmitting a power supply to the motor 32 to stop the handle protection cap 40 in place safety system.


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